Something as absurd as long divisions are done differently depending on where you study.

I am writing down the two systems I know better: the Spanish one and the UK/US one (hereafter Anglo-Saxon).

However, the European system is a bit different from the Spanish one (largely similar, it only differs in separing the quotient from the calculation), the Brazilian is like the Spanish but writing down the calculation, like in the Anglo-Saxon system, the Mexican is like the Anglo-Saxon system but doing the calculation mentally, like in the Spanish one.

The Latin American, German or Italian systems are a tad different as well.

Nonetheless, they all are very similar. They just differ from each other in how you write a couple of things, in the position of the dividend, divisor and quotient, and in whether calculations are specifically written down or calculated mentally.

In Image 1 you have an example of numerical division, and in Image 2 you have an example of polynomial division (in this case, calculations are specified as well in the Spanish system).